Yong Lai

The deterioration of Portland cement pervious concrete (PCPC) subjected to wet-dry cycles in the simulated acid rain solution was investigated; 4% silica fume (SF) and 8% fine aggregate (FAG) were used to replace part of cement and the coarse aggregates (weight by weight), respectively. The wear resistance, the compressive, and flexural strength of PCPC were measured. The results show that after 12 wet-dry cycles in acid rain solution the compressive strength and the flexural strength of control PCPC are decreased by 30.7% and 40.8%. The final compressive strength of PCPC with 4% SF and PCPC with 8% FAG is increased by 6.9% and 30.3%, and the final flexural strength is increased by 25.4% and 72.3%, respectively. The wear loss of PCPC is decreased by 58.8% and 81.9% when 4% SF and 8% FAG is added to PCPC, respectively. The microstructures of PCPC with wet-dry cycles are also discussed.

In this paper, the method of melting snow on airport pavement with carbon fibre grille reinforced composites is presented to avoid the adverse effects of snow-melting chemicals. The strength and resistance of different composites are analysed. The field snow-melting experiments of pavement in which carbon fibre grilles are embedded in different depths are conducted when the snow is heavy. The temperatures along the depth of pavement are analysed at different times. It is shown that, with an input power of 300 W m−2, the 2.6 cm thick snow can be melted within 4 hours, which is just for melting snow at this condition. The snow-melting of 5 cm embedded depth of carbon fibre grille is better. The findings indicate that the method of melting snow on airport pavement containing the grille made of carbon fibre heating wires and steel bar is feasible in the snowy weather condition.